hb288064mm1 Renesas Electronics Corporation., hb288064mm1 Datasheet - Page 75

• Manufacturer Part Number: hb288064mm1
• Description: Multimediacard 64 Mbyte
• Manufacturer: Renesas Electronics Corporation.

Access Time
Parameter
Synchronous access delay cycles
Synchronous access delay
Asynchronous access delay
Memory access time
Note:
In the CSD are two fields to code the asynchronous and the synchronous access delay time:
The value for the CSD field NSAC is calculated from N
and rounding up to the next integer:
The value for the CSD field TAAC is 1 ms:
For more details on NSAC and TAAC CSD-entries refer to Chapter “Card Specific Data (CSD)”.
References
[1] The MultiMediaCard, System Specification 2.11, MultiMediaCard Association
Number Representations
TAAC, asynchronous access delay
NSAC, maximum number of cycles for receiving and interpreting of a command frame
NSAC = 0x01
TAAC = 0x0E
decimal numbers: 1234, no special characters
hexadecimal numbers: 0xAB, leading 0x, each digit represents 4 bits.
binary numbers (single bit): ‘0’.
binary number (unsigned bit vector): “100100”.
1k is equal to 1024.
1M is equal to 1k*1k.
1. Refer to Chapter “Time-out Condition”.
NSAC = [N
TAAC = [T
AAD
SAD
] = 1 ms
/100] = [16/100]
Symbol
N
T
T
t
AT
SAD
AAD
SAD
Typ
—
—
300
300.8
SAD
Max
16
0.8
—
—*
1
(maximum: 16 cycles) by division with 100
Unit
cycles
s
s
s
Remark
at 20 MHz clock frequency
at 20 MHz clock frequency
HB288064MM1
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